灾变、渐变及小天体撞击地球

CATASTROPHISM, GRADUALISM AND THE EVENTS OF SMALL CELESTIAL BODY'S STRIKING THE EARTH

根据近年来有关研究新进展，概括地评述了地质灾变论、渐变论、新灾变论及事件地层学的形成、发展、理论实质及其在地球科学理论与实践中的重大现实意义．

This paper firstly made a brief review about Catastrophism Gradualismand Neocatastrophism in Geology and then did some researcles on event stratigraphy's formation, development, therotical essence and its importance in earth sciences.